#### what is the meaning of ar grade for chemicals yahoo answers

Answers is the place to go to get the answers you need and to ask the questions you want Calculating the Mean, Median, and Mode - ThoughtCo

• The MeanThe MedianThe ModeOther Statistical ElementsWhen people talk about statistical averages, they are referring to the mean. To calculate the mean, simply add all of your numbers together. Next, divide the sum by however many numbers you added. The result is your mean or average score. For example, let's say you have four test scores:15, 18, 22, and 20. To find the average, you would first add all four scores together, then divide the sum by four. The resulting mean is 18.75. Written out, it looks something like this:1. (15 + 18 + 22 + 20) / 4 = 75 / 4 = 18Periodic Table Quiz BritannicaQUIZ:Test your bond with the periodic table of elements in this quiz on all 118 chemical elements and their symbols. You may be familiar with the chemical symbols for hydrogen and oxygen, but can you match such lower-profile elements as gadolinium and erbium with their corresponding symbols?